Reverse für 'Detail' mit Schlüsselwortargumenten '{' id ': 5}' nicht gefunden. 1 Muster versucht: ['Beiträge/(? P <slug> [\\ w -] +)/$']

Question

Ich bin super mit NoReverseMatch bei/posts/Fehler stecken. Vielleicht übersehe ich etwas Kleines oder vielleicht ist dieses Thema viel größer als das, wo ich graben möchte.

http://imgur.com/nlyMi9V Fehlermeldung, wenn models.py ist wie folgt:

def get_absolute_url(self): 
     #return reverse("detail", kwargs={ "slug": self.slug }) 
     return reverse("posts:detail", kwargs={ "slug": self.slug }) 

http://imgur.com/a/RilrB Fehlermeldung, wenn models.py ist wie folgt:

def get_absolute_url(self): 
     return reverse("detail", kwargs={ "slug": self.slug }) 
     #return reverse("posts:detail", kwargs={ "slug": self.slug }) 

---

models.py

#from _future_ import __unicode__literals 
from django.db import models 
from django.core.urlresolvers import reverse 
from django.db.models.signals import pre_save 

from django.utils.text import slugify 

# Create your models here. 
# MVC Models Views Controller 

def upload_location(instance, filename): 
    # filebase, extension = filename.spilt(".") 
    # return "%s/%s.%s" %(instance.id, instance.id, filename) 
    return "%s/%s" %(instance.id, filename) 

class Post(models.Model): 
    title = models.CharField(max_length=120) 
    slug = models.SlugField(unique=True) 
    image = models.ImageField(upload_to=upload_location, 
     null=True, 
     blank=True, 
     width_field="width_field", 
     height_field="height_field") 
    height_field = models.IntegerField(default=0) 
    width_field = models.IntegerField(default=0) 
    content = models.TextField() 
    updated = models.DateTimeField(auto_now=True, auto_now_add=False) 
    timestamp = models.DateTimeField(auto_now=False, auto_now_add=True) 

    def __unicode__(self): 
     return self.title 

    def __str__(self): 
     return self.title 

    def get_absolute_url(self): 
     #return reverse("detail", kwargs={ "slug": self.slug }) 
     return reverse("posts:detail", kwargs={ "slug": self.slug }) 

    class Meta: 
     ordering = ["-timestamp", "-updated"] 


def create_slug(instance, new_slug=None): 
    slug = slugify(instance.title) 
    if new_slug is not None: 
     slug = new_slug 
    qs = Post.objects.filter(slug=slug).order_by("-id") 
    exists = qs.exists() 
    if exists: 
     new_slug = "%s-%s" %(slug, qs.first().id) 
     return create_slug(instance, new_slug=new_slug) 
    return slug 

def pre_save_post_receiver(sender, instance, *args, **kwargs): 
    if not instance.slug: 
     instance.slug = create_slug(instance) 

pre_save.connect(pre_save_post_receiver, sender=Post) 

views.py

from django.contrib import messages 
from django.core.paginator import Paginator, EmptyPage, PageNotAnInteger 
from django.http import HttpResponse, HttpResponseRedirect 
from django.shortcuts import render, get_object_or_404, redirect 

from .forms import PostForm 
# Create your views here. 
from .models import Post 


def post_create(request): 
    form = PostForm(request.POST or None, request.FILES or None,) 
    if form.is_valid(): 
     instance = form.save(commit=False) 
     instance.save() 
     # message success 
     messages.success(request, "Successfully Created!") 
     return HttpResponseRedirect(instance.get_absolute_url()) 
    context = { 
     "form": form, 
    } 
    return render(request, "post_form.html", context) 

def post_detail(request, slug=None): 
    #instant = Post.objects.get(id=0) 
    instance = get_object_or_404(Post, slug=slug) 
    context = { 
     "title": instance.title, 
     "instance": instance, 
    } 
    return render(request, "post_detail.html", context) 

def post_list(request): 
    queryset_list = Post.objects.all() #.order_by("-timestamp") 
    paginator = Paginator(queryset_list, 5) # Show 5 contacts per page 
    page_request_var = "page" 
    page = request.GET.get(page_request_var) 
    try: 
     queryset = paginator.page(page) 
    except PageNotAnInteger: 
     # If page is not an integer, deliver first page. 
     queryset = paginator.page(1) 
    except EmptyPage: 
     # If page is out of range (e.g. 9999), deliver last page of results. 
     queryset = paginator.page(paginator.num_pages) 

    context = { 
     "object_list": queryset, 
     "title": "List", 
     "page_request_var": page_request_var 
     } 
    return render(request, "post_list.html", context) 
    #return HttpResponse("<h1>List</h1>") 


def post_update(request, slug=None): 
    instance = get_object_or_404(Post, slug=slug) 
    form = PostForm(request.POST or None, request.FILES or None, instance=instance) 
    if form.is_valid(): 
     instance = form.save(commit=False) 
     instance.save() 
     # message success 
     messages.success(request, "<a href='#'>Item</a> Saved", extra_tags='html_safe') 
     return HttpResponseRedirect(instance.get_absolute_url()) 

    context = { 
     "title": instance.title, 
     "instance": instance, 
     "form":form, 
    } 
    return render(request, "post_form.html", context) 

def post_delete(request, slug=None): 
    instance = get_object_or_404(Post, slug=slug) 
    instance.delete() 
    messages.success(request, "Successfully deleted!") 
    return redirect("posts:list") 

urls.py

from django.conf.urls import url 
from django.contrib import admin 
from . import views 

# from .views import (
#  post_list, 
#  post_create, 
#  post_detail, 
#  post_update, 
#  post_delete, 
# ) 

# video: https://www.youtube.com/watch?annotation_id=annotation_3160187747&feature=iv&index=14&list=PLEsfXFp6DpzQFqfCur9CJ4QnKQTVXUsRy&src_vid=nw3R2TXlkwY&v=1KuyH8JVn6A 
# shows a different solution here for version 1.10 

urlpatterns = [ 
    #url(r'^$', views.post_home), 
    # url(r'^$', views.post_list, name='list'), 
    # url(r'^create/', views.post_create), #name='create' 
    # url(r'^(?P<slug>[\w-]+)/', views.post_detail, name='detail'), 
    # url(r'^(?P<slug>[\w-]+)/edit/', views.post_update, name='update'), 
    # url(r'^(?P<slug>[\w-]+)/delete/', views.post_delete), 

    url(r'^$', views.post_list, name='list'), 
    url(r'^create/$', views.post_create, name='create'), 
    url(r'^(?P<slug>[\w-]+)/$', views.post_detail, name='detail'), 
    url(r'^(?P<slug>[\w-]+)/edit/$', views.post_update, name='update'), 
    url(r'^(?P<slug>[\w-]+)/delete/$', views.post_delete), 

    # url(r'^$', posts.views.post_home), 
    # url(r'^create/', home_create), 
    # url(r'^list/', home_list), 
    # url(r'^detail/', home_detail), 
    # url(r'^update/', home_update), 
    # url(r'^delete/', home_delete), 

    # url(r'^posts/$', "<appname>.views.<function_name>"), 
] 

post_list.py

{% extends "base.html" %} 

{% block head_title %} 
{{ instance.title }} | {{ block.super }} 
{% endblock head_title %} 


{% block content %} 

    <div class="row justify-content-md-center"> 
     <div class='col-md-8'> 
      <h1>{{title}}</h1> 
     </div> 

     {% for obj in object_list %} 

     <div class='col-md-8 pt-3'> 
      <div class="card" style="min-width: 20rem;"> 
       {% if obj.image %} 
       <img src="{{ obj.image.url }}" class="card-img-top"> 
       {% endif %} 
       <div class="card-body"> 
       <h4 class="card-title"> 
        <a href='{{ obj.get_absolute_url }}'>{{ obj.title }}</a> 
        <small>{{ obj.timestamp|timesince }} ago</small> 
       </h4> 
       <p class="card-text">{{ obj.content|linebreaks|truncatechars:120 }}</p> 
       <p class="card-text">{{ obj.updated }}</p> 
       <p class="card-text">{{ obj.id }}</p> 
       <!-- <a href='{% url "posts:detail" id=obj.id %}'>{{ obj.title }}</a><br/> --> 
       <a href="{{ obj.get_absolute_url }}" class="btn btn-primary">View</a> 
       </div> 
      </div> 
     </div> 

     {% endfor %} 

     <div class='col-md-8'> 
      <div class="pagination"> 
       <span class="step-links"> 
        {% if object_list.has_previous %} 
         <a href="?{{ page_request_var }}={{ object_list.previous_page_number }}">previous</a> 
        {% endif %} 

        <span class="current"> 
         Page {{ object_list.number }} of {{ object_list.paginator.num_pages }}. 
        </span> 

        {% if object_list.has_next %} 
         <a href="?{{ page_request_var }}={{ object_list.next_page_number }}">next</a> 
        {% endif %} 
       </span> 
      </div> 
     </div> 

    </div> 

{% endblock content %} 

Answer 1

der Fehler aus dieser Linie

kommt

<!-- <a href='{% url "posts:detail" id=obj.id %}'>{{ obj.title }}</a><br/> --> 

<!-- ist ein HTML-Kommentar, also versucht Django immer noch, die URL umzukehren, wenn sie die Vorlage rendert.

Sie können die Zeile entweder komplett entfernen, sie in einen Django-Kommentar {# ... #} ändern oder sie ändern, um den Slug anstelle von id zu verwenden.